Type-writing machine.



C. B. YAW.

TYPEWRITING MACHINE;

- APPLICATION FILED AUG.I.-!9l4- 1,234,248. Patented July 24, 1917.-

2 swans-mar I.

,- fr) I v INVENTU HIEAT'TURNEY WITNEESEE= h M o B. YAW. TYPE WRITING MACHINE. APPLICATION FILED AUG-M1914.

Patented July 24,1917.

2 SHEETS-SH EET 2.

INVE-NTD WITNESSES]:

HISATTURNEY Your T OFFTUE.

CLIO B. YAW, OF ARLINGTON, NEW JERSEY, ASSIGNOR TO REMINGTON TYPEWRITER COMPANY, OF ILI ON, NEYV YORK, A CORPORATION OF NEW YORK.

TYPE-WRITING MACHINE.

1,23d 2dh.

Application filed August 1, 1914.

To all whom it may concern:

Be it known that I, 61.10 B. Yaw, citizen of the United rltates, and residcnt of Arlington, in the county of Hudson and State of New Jersey, have invented certain new and useful Improvements in Type-Vi riting Ma chines, of which the following is a specifier tion.

My present invention relates to back spacing mechanism for typewriting machines and its principal object is to provide new and improved mechanism of the character specified.

To the above and other ends my invention consists in the features of construction, combinations of devices and arrangements of parts hereinafter described and particularly pointed out in the claims.

In the accompanying drawings illustrating the preferred form of my present invention,

Figure 1 is a fragmentary front-to-rear vertical sectional view of a typewriting machine embodying my invention, parts of the machine unnecessary to a complete unden standing of said invention being omitted.

Fig. 2 is a front view partly in section showing the back spacnig key and connected parts.

Fig. 3 is a rear elevation of part of the back spacing mechanism.

Fig. 4c is a sectional view taken axially of the spring drum.

Fig. 5 is a fragmentary face view of cer tain of the back spacing devices.

Referringto Fig. 1 the main frame of the machine is shown as comprising end plates 1 connected by atop plate 2. Mounted on the rear of the main-frame is a grooved track-way 3 which cooperates through antifriction balls 1- with the slide bar 5 of a traveling platen carriage which further comprises parallel arms 6 fixed to said bar 5 near its ends and extending upward, said arms supporting supplementary arms or platen frame pieces 7 which providebearings for the shaft 8 of a platen 9. Printing instrumentalities (not shown) cooperate with the front of said platen. Secured to the lower part of the slide bar 5 is a rack bar 10 with whichimeshes an inclined gear wheel 11 that is comprised in the connections between said carriage and its motor or spring drum. Said motor is mounted on a frame or plate 12 that 1s secured by screws Specification of Letters Patent.

Patented July 2st, 121 '7. Serial No. 854,429.

18 to lugs 14 projecting inward from the end plates 1, the plate 12 inclining upward and forward at the rear of the machine and be ing out out to lighten it and also to providespace for various devices including the motor or spring drum mechanism. This latter is mounted directly on a U-shaped frame or bracket 15 that is adjustably secured to the f -ame 12 by headed screws 16 passing through slots 17 in said frame (Figs. 3 and 4). As clearly shown in Fig. at a shaft or stem 18 is fixed to the bracket 15 at about the middle thereof and projects upward and rearward therefrom. Fixedly confined between a shoulder on said shaft and the face of the bracket 15 is a casing or drum l9 containing a coiled motor or carriage spring 20, the outer end whereof is secured to the stationary casing 19. The inner end of said 7 spring is secured to a hub men'iber 21 which bears rotatably on the stationary shaft 18 and is provided with a flange 22 to which the gear wheel 11 is fixedly secured by means of screws 23. The construction is suchthat said gear wheel transmits the power of'the spring to the carriage and constantly urges it leftward across the top plate, leftward step-by-step movements being controlled by carriage feeding or escapement devices, not shown herein but preferably of the character disclosed in my co-pending application, Serial No. 855,551, filed August 7, 1914.

In order to move the carriage rightward step-by-step in opposition to the carriage motor or spring drum for the purpose of positioning the carriagerapidly and expeditiously to make corrections and for other purposes, back spacing devices are provided comprising a key actuated pawl which cooperates with the gear wheel 11 to turn it backward or in the opposite direction to the arrow in Fig. 3. Said pawl, indicated by the numeral 24, is shown in all the figures except Fig. 2, being arranged below the gear wheel 11 and pivoted eccentrically thereof on a shoulder screw 25 which is threaded into the free end of an arm or pawl carrier 26 from the rear and is secured thereto by a nut 27. Said arm 26 overlies and extends radially of the gear wheel 11 and is pivoted to swing coaxially therewith, being rotata-- bly mounted on the shouldered portion of the shaft 18. Separating the arm 26 and a bearing without rubbing over the face of l k 7 the gear wheel ll, the spring 50 supplying.

sufiicient friction toprevent rattling or an due looseness of said arm. A pin 32 on the pawl24 engages in a slot 33 in the arm 26,

' thereby limiting turning movement of the 38 which is provided at its ends with ears i so.

pawl on the arm and preventing undue displacement of said pawl. The pawl is provided with a downwardly extending fork or bifurcated portion 2%, and engaging in an opening or slot 34: in said fork is the rounded or ball end 35 of an upwardly extending crank arm 36 which is secured to the rear end of a rock shaft 37 which is arranged fore and aft of the machine and underlies the printing key connections. The rear end portion of said rock shaft bears in abracket 39 that receive securing screws 40 by which said bracket is fixed to the frame 12. bracket is also provided with a central ear or lip 4L1 which is formed with anotch or slot 42, the sides of which cooperate with the head of the screw 25 to limit swinging movements of the pawl 24 andits ac'tuatingdevices (Fig. the rock shaft 37 bears in a stationary front plate l3 which is secured at its ends to the end plates 1 (Figs. 1 and 2). A crank arm 44 is fixed to said rock shaft behind the plate 43 and inclined leftward and upward, having a forward off-set at its upper end to which is pivotally connected a key stem 45 which projects through openings in a stationary cover plate 43 and in an underlying lip of the plate 45. Said stem is provided at its upper end with a back spacing key or button s6 and is pivotally connected at 47 to one arm of a U-shaped lever frame 48 fulcrumed on a fixed pin 4-9. A spring 50 having a stationary anchorage is connected to the other arm of said lever member and operates to restore the back spacing key d6 and the parts actuated thereby to normal position after an operation, and maintains said key and parts in normal position. At this time the screw head 25 is held against the right-hand edge of the slot 42 and the pin 32 is at the bottom of the slot 33 (Fig. 8), the teeth of the pawl 2 f being out of the path of the teeth of the gear wheel 11 so as not to interfere with step-by-step printing movements.

When the key 46 is depressed it operates through the crank arm 4e and rock shaft 37 to turn the crank arm 36 which first acts to turn the pawl 24: on its pivot 25 without Said the screw 25 with Theforward end portion of moving the carrier or drum 26, the point of contact of the'ball 35 with the side of the slot 34 varying during, this portion of the key stroke, approaching closer to the pivot 25 of the pawl. This initial independent movement of the pawl operates to throw the pawl tooth into engagement with the teeth of the gear wheel 11 (Fig. 5). When in the course of this movement the pin 32 engages with the upper end of the slot 33, as shown in said Fig, 5, theindependent pivotal movement of the pawl eccentric of the gear wheel 11 ceases, and further movement communicated from the crank arm 36 will operate to turn the arm 26 on its pivot, said arm carrying the pawl 2e bodil with it and said awl swln in or rotating as a whole or bodily around the pivotal axis of the arm 26 and of the gear wheel 11. As a result the pawl acting on the gear wheel 11 will turn said, gear wheel backward oppositely to the arrow in Fig. 3 and the gear wheel acting on the carriage throughthe rack 10 will move said carriage backward or toward the'right in opposition to the spring motor 20. The backward movement of the carriage and actuating mechanism will continue until the parts are arrested by the engagement of the head of slot 42. The parts are so proportioned and arrangedthat as a result of this movement the carriage has been back spaced toan extent corresponding to a single letter space. This back spacing movement of the carriage is repeated at each. actuation of the back spacing key.

It will be observed that the back spacing mechanism provided by my present invention is extremely simple and has proven highly effective in operation.

Some of the features herein disclosed are not claimed as they form in part the subjecte matlter of my co-pending application aforesalc.

Various changes maybe made without departing from my invention.

What i claim as new and desire to secure by Letters Patent, is g 1. In a typewriting machine, the combination of a carriage, a gear wheel connected to said carriage,and key operated.

back spacingdevices comprising an arm coaxial with said gear wheel, a friction spring effective on said arm, a pawl pivoted to said arm, and means for actuating said pawl and said arm, said means comprising a key, controlled rock shaft and a crank arm fixed to said rock shaft and loosely engaging said pawl. i

2. In a typewriting machine, the combination of a carriage, a gear wheel connected to said carriage, and key operated back spacing devices comprising an arm coaxial with said the left-hand side of the gear wheel, a pawl pivoted to said arm, stop devices limiting the pivotal movements of said pawl in both directions on said arm, and means for actuating said pawl and said arm, said means comprising a key controlled rock shaft and a crank arm connected to said rock shaft and having a direct loose connection with said pawl.

3. In a typewriting machine, the combination of a carriage, and back spacing devices therefor comprising a gear wheel, a back spacing pawl, and means for actuating said pawl, said means comprising a rock shaft, a crank arm connected to said rock shaft and contactively en aging directly with said pawl, a second cran I arm on said rock shaft,

and a key connected to said second crank arm, the point of contactlve engagement varying during the key stroke.

4. In a typewriting machine, the combination of a carriage, and back spacing devices therefor comprising a gear wheel, a back spacing pawl, and means for actuating said pawl, said means comprising a rock shaft, a crank arm having a ball end engaging a fork in said pawl, a second crank arm on said rock shaft, and a key connected to said second crank arm.

Signed at the borough of Manhattan, city of New York, in the county of New York, and State of New York, this 81st day of 30 July, A. D. 1914.

OLIO B. YAW.

Witnesses:

M. F. HANNWEBER, M. W. PooL.

topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

